Banana skin (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">banana skin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for peel that I've seen before include "Strip; rind" , "Citrus skin" , "Strip the skin off" , "old tower" , "A PM; a fortified tower" .)